Answer:
Th proportion of satisfied customers is
Step-by-step explanation:
Although 1,000 surveys were send, we may consider our sample is only made by the 823 surveys returned.
Out of the returned surveys (n=823), 635 people said they were satisfied with the restaurant.
Then, the p-hat (proportion of satisfied people) of this sample is calculated as:
If we consider as the sample size all the surveys sent, and assuming the surveys not returned belong to non-satisfied customers, the proportion of satisfied clients is: